Galileo Quartz Clock

M. Bloch, M. Meirs, M. Rosenfeld

Abstract:	Frequency Electronics has developed and tested a quartz oscillator for use in the Galileo experiment (orbiter and Probe) for Jupiter mission 1982. This oscillator has achieved significant performance breakthroughs by the use of an "SC" cut, double rotated, crystal in a titanium Dewar flask. Some of the performance parameters are: Radiation Sensitivity: 2 x 10-14/rad "g" Sensitivity 2 x 10-10/9 Optimum Deceleration Sensitivity: 2 x 10-10425 g Power Dissipation: 1.2 watts Size: 1.8" dia. by 5.5"lg Operating Pressure: vacuum te 20 torrs Short Term Stability: 3 x 10-12/second The quartz oscillator uses a double proportional control oven to achieve a temperature coefficient of less than 1 x 10-10/10 degrees C. The results obtained on other "SC" cut crystals indicate the possibility of significant performance improvements in airborne, shipboard, missile timing, navigation and high speed communication systems.
Published in:	Proceedings of the 11th Annual Precise Time and Time Interval Systems and Applications Meeting November 27 - 29, 1979 Goddard Space Flight Center Greenbelt, Maryland
Pages:	441 - 455
Cite this article:	Bloch, M., Meirs, M., Rosenfeld, M., "Galileo Quartz Clock," Proceedings of the 11th Annual Precise Time and Time Interval Systems and Applications Meeting, Greenbelt, Maryland, November 1979, pp. 441-455.
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